and canada. and how do the dogs get here. >> by accruing points over the year. the top 150 dogs make it into the national finals. those are very coveted spots and everybody wants to be here running in the big show. >> reporter: and give me an idea how big the sport it out there. >> i think there is 700 dogs on the high point list. that would give must indication. i've just come back from utah and colorado on a big western circuit, and it's a busy intensely competitive sport and refinements are a beauty. what a great thing to see. >> reporter: and i think intense is word to use because this is your dog, right? >> yes. this is my dog ross and she is a competitor and very intense, as you see, wanting to be the one doing the job. >> reporter: but we have another dog out there doing the job and look at that dog just holding the sheep at bay. so explain how this works. >> this is when she asks the dogs to go left, that's left. when she goes to the right, that's right. and to walk up, is to wake up, like that. all of these things meant to go to catch the sheep, catching the sheep and sendin
